20511322017 has 8 divisors (see below), whose sum is σ = 27356652960. Its totient is φ = 13670102880.

The previous prime is 20511321983. The next prime is 20511322067. The reversal of 20511322017 is 71022311502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20511322017 - 2⁷ = 20511321889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20511322067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016292 + ... + 1036277.

It is an arithmetic number, because the mean of its divisors is an integer number (3419581620).

Almost surely, 2^20511322017 is an apocalyptic number.

It is an amenable number.

20511322017 is a deficient number, since it is larger than the sum of its proper divisors (6845330943).

20511322017 is a wasteful number, since it uses less digits than its factorization.

20511322017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055903.

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 20511322017 its reverse (71022311502), we get a palindrome (91533633519).

The spelling of 20511322017 in words is "twenty billion, five hundred eleven million, three hundred twenty-two thousand, seventeen".